.page-about {
  --about-rail: 246px;
  --about-flow-gap: 58px;
  --tl-pad: 30px;
  background: linear-gradient(180deg, var(--paper-light) 0%, var(--paper) 38%, var(--paper) 100%);
  color: var(--carbon);
  font-family: var(--font-sans);
  padding-bottom: 76px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 22px 0 10px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding: 6px 0 32px;
  border-bottom: 1px solid var(--line-brass);
}

.page-about .about-hero__title {
  margin: 14px 0 16px;
  font-size: clamp(30px, 6.6vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  font-weight: 800;
  color: var(--ink-green-deep);
}

.page-about .about-hero__lead-text {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 2.5vw, 16.5px);
  line-height: 1.85;
  color: rgba(20, 20, 19, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure .media-frame {
  overflow: hidden;
  border: 1px solid var(--line-brass);
  background: var(--ink-green-deep);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12.4px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--brass-dark);
}

/* ---------- 速览刻度条 ---------- */
.page-about .about-glance {
  padding: 26px 0 30px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-glance__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
}

.page-about .about-glance__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(23px, 5vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--brass-dark);
}

.page-about .about-glance__label {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(20, 20, 19, 0.6);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 34px;
  padding-top: 36px;
}

.page-about .about-rail {
  padding: 22px 20px 24px;
  background: linear-gradient(160deg, rgba(31, 58, 61, 0.94), rgba(14, 43, 36, 0.98));
  border: 1px solid var(--line-brass);
  color: var(--cream);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--brass);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 4px 0;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(248, 244, 234, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-rail__list a::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border: 1px solid var(--brass);
  transform: rotate(45deg);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .about-rail__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed rgba(217, 178, 106, 0.34);
  font-size: 12.8px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--about-flow-gap);
}

.page-about .about-section {
  scroll-margin-top: 96px;
}

.page-about .about-section__title {
  margin: 12px 0 18px;
  font-size: clamp(23px, 3.8vw, 34px);
  line-height: 1.24;
  font-weight: 800;
  color: var(--ink-green-deep);
}

.page-about .about-prose p {
  margin: 0 0 15px;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(20, 20, 19, 0.84);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 起点三块 ---------- */
.page-about .about-points {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-point {
  padding: 20px 18px 22px;
  background-color: var(--paper-light);
  background-image: linear-gradient(90deg, var(--brass) 0 3px, transparent 3px);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .about-point h3 {
  margin: 0 0 9px;
  font-size: 15.5px;
  line-height: 1.45;
  color: var(--ink-green);
}

.page-about .about-point p {
  margin: 0;
  font-size: 13.6px;
  line-height: 1.78;
  color: rgba(20, 20, 19, 0.72);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure .media-frame {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--teal-slate);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-roles {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.page-about .about-role {
  padding: 7px 14px 7px 12px;
  font-family: var(--font-mono);
  font-size: 12.4px;
  letter-spacing: 0.06em;
  color: var(--ink-green);
  background: var(--paper-light);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 100%, 0 100%);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.page-about .about-role:hover {
  background: var(--ink-green);
  color: var(--amber);
  border-color: var(--brass);
  transform: translateY(-2px);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 var(--tl-pad);
  border-left: 1px solid var(--line-brass);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 30px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 7px;
  left: calc(var(--tl-pad) * -1);
  width: 11px;
  height: 11px;
  background: var(--paper);
  border: 2px solid var(--brass-dark);
  transform: translateX(-50%) rotate(45deg);
}

.page-about .about-timeline__item.is-rust::before {
  border-color: var(--rust);
  background: var(--rust);
}

.page-about .about-timeline__stamp {
  display: inline-block;
  margin-bottom: 9px;
  padding: 3px 9px;
  font-size: 11.8px;
  letter-spacing: 0.12em;
  color: var(--brass-dark);
  border: 1px solid rgba(140, 90, 43, 0.4);
}

.page-about .about-timeline__item.is-rust .about-timeline__stamp {
  color: var(--rust);
  border-color: rgba(179, 74, 46, 0.45);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink-green-deep);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 38em;
  font-size: 14.2px;
  line-height: 1.8;
  color: rgba(20, 20, 19, 0.76);
}

.page-about .about-timeline__band {
  margin: 28px 0 0;
}

.page-about .about-timeline__band .media-frame {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--teal-slate);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-timeline__band img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 20px;
  margin-top: 24px;
}

.page-about .about-partners__lead {
  padding: 26px 22px 28px;
  background: linear-gradient(150deg, var(--ink-green) 0%, var(--teal-slate) 100%);
  color: var(--cream);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-partners__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-partners__lead p {
  margin: 0;
  font-size: 14.6px;
  line-height: 1.85;
  color: rgba(248, 244, 234, 0.86);
}

.page-about .about-partners__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partners__legend li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 13px;
  align-items: start;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13.8px;
  line-height: 1.78;
  color: rgba(20, 20, 19, 0.78);
}

.page-about .about-partners__legend li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-legend-key {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--brass-dark);
  border: 1px solid var(--brass-dark);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 0 100%);
}

/* ---------- 用户规模 ---------- */
.page-about .about-users {
  display: grid;
  gap: 26px;
}

.page-about .about-users__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stat {
  padding: 18px 16px 20px;
  background: var(--paper-light);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 4vw, 29px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--ink-green);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 12.8px;
  line-height: 1.62;
  color: rgba(20, 20, 19, 0.62);
}

/* ---------- 规范卡片 ---------- */
.page-about .about-cards {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-card {
  padding: 20px 18px 24px;
  background: var(--paper-light);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--brass);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 14.5px;
  letter-spacing: 0.05em;
  color: var(--ink-green);
}

.page-about .about-card p {
  margin: 0;
  font-size: 13.4px;
  line-height: 1.78;
  color: rgba(20, 20, 19, 0.72);
}

.page-about .about-trust__note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--brass);
  font-family: var(--font-mono);
  font-size: 12.8px;
  line-height: 1.8;
  color: rgba(20, 20, 19, 0.66);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  margin-top: 58px;
  padding: 30px 24px 34px;
  background: linear-gradient(135deg, var(--ink-green-deep) 0%, var(--teal-slate) 100%);
  color: var(--cream);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 28px 100%, 0 calc(100% - 28px));
}

.page-about .about-next h2 {
  margin: 0 0 12px;
  font-size: clamp(20px, 3.6vw, 28px);
  line-height: 1.3;
  color: var(--cream);
}

.page-about .about-next p {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 14.6px;
  line-height: 1.82;
  color: rgba(248, 244, 234, 0.82);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next .btn--ghost {
  color: var(--amber);
  border-color: rgba(232, 154, 60, 0.5);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-glance__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-glance__list > li + li {
    padding-left: 22px;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-timeline {
    --tl-pad: 42px;
  }

  .page-about .about-users {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
    padding: 20px 0 48px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__list {
    display: block;
  }

  .page-about .about-rail__list li + li {
    margin-top: 6px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>